Research working process sorting of materials and dynamic parameters of vibration screen

Abstract

Reasonable preconditions and assumptions in the study of the working process of sorting construction material are selected model of the system "vibration damping roller - sorting material", which adequately reflects the actual sorting process. The influence factors of the process of material sorting are studied: granulometric composition and grain shape of the fraction, density and moisture content of the raw material, thickness of the material layer on the screen, the speed of the grains on the screen. As for the sieve, the following factors were: the sorting mode and its parameters - the amplitude and frequency of oscillations, the angle of inclination of the box, the shape and size of the holes of the sieve, the size of the surface of the sorting and the mode of operation of the sieve, which implements these parameters. It has been found that increasing the length increases the probability of passing particles through the screen, increasing the efficiency of the sorting. The working process of material sorting with successive movement of material particles in the field of harmonic and subsequently and shock-vibrational action is investigated. The evaluation of the sorting process and the parameters of this process are determined. It is proved that the use of common harmonic and shock modes of motion is effective. It is this hypothesis that is the basis of this study. The reliability of the direction is due to the fact that, when implementing the vibration damping mode of sorting, the force effect on the material particles is significantly increased. As a result, the possibility of self-cleaning of those openings in which material particles are stuck and the increase of efficiency and productivity of the sieve is realized. The design scheme is developed and the equations of the joint motion of the studied system are obtained. The solution of the equations is determined by dimensionless parameters, which serve as criteria for evaluation of the vibration shock mode of sorting. The determinated of changes in boundaries of dimensionless parameters that reflect the steady-state operation of a shock-vibration sieve, implementing an efficient sorting process in a mode that is close to resonant. A map of stability was provided and the vibration shock mode was provided at the main resonance. Experimental researches of efficiency of realization of joint vibration and shock mode of sorting on the newly created installation are carried out. Comparison of the parameters obtained by theoretical and experimental paths confirmed the reliability of the assumptions and assumptions adopted in the study. The algorithm of calculation of the "sieve - material" system is developed, the construction of a vibration damping crane is proposed, the novelty of which is confirmed by a patent for a utility model.